865947 has 4 divisors (see below), whose sum is σ = 1154600. Its totient is φ = 577296.

The previous prime is 865937. The next prime is 865957. The reversal of 865947 is 749568.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (865937) and next prime (865957).

It is not a de Polignac number, because 865947 - 2⁷ = 865819 is a prime.

It is a D-number.

It is a Duffinian number.

865947 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (865937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144322 + ... + 144327.

It is an arithmetic number, because the mean of its divisors is an integer number (288650).

2⁸⁶⁵⁹⁴⁷ is an apocalyptic number.

865947 is a deficient number, since it is larger than the sum of its proper divisors (288653).

865947 is a wasteful number, since it uses less digits than its factorization.

865947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288652.

The product of its digits is 60480, while the sum is 39.

The square root of 865947 is about 930.5627329740. The cubic root of 865947 is about 95.3155527285.

The spelling of 865947 in words is "eight hundred sixty-five thousand, nine hundred forty-seven".